package thread;

public class Demo19 {
    private static int count = 0;
    public static void main(String[] args) throws InterruptedException {
        //先创建出一个对象，使用这个对象作为锁
        Object locker = new Object();
        Object locker2 = new Object();

        Thread t1 = new Thread(() -> {
            synchronized (locker) {
                for (int i = 0; i < 50000; i++) {
                    count++;
                }
            }

        });

        Thread t2 = new Thread(() -> {
            synchronized (locker) {
                for (int i = 0; i < 50000; i++) {
                    count++;
                }
            }
        });

        t1.start();
        t1.join();
        t2.start();
        //如果不加join.三个线程并发执行，那么count打印的结果就不是t1和t2算完的结果(类似于读脏数据)
        t2.join();
        System.out.println( "count = " + count);
    }
}
